It sounds as if you have migraines. They are notorious for being one sided, and not getting relief from regular pain meds. I would suggest you see a neurologist, but if you can't at least a GP. They have new medications out which can relieve the headache, and others that prevent the headaches. Unfortunately, if you keep taking OTC meds, you can end up with rebound headaches, so you have to limit the OTC to a few times a week. That is why you cannot get complete relief. Best wishes to you!!

I too used to suffer from migraine headaches & this is what yours sound like also.Then they discovered Immitrex, & no more 24/7 headaches for 6 weeks at a time. If I get one now, I take generic excedrin with a cup of coffee. It has been shown that the caffeine in the coffee, (& excedrin) help with migraines. I suggest you talk to your doctor about this since we are not doctors & know nothing about any other health conditions you may have or if it is safe for you to try this. I am giving you a list of migraine medications in the link below..https://www.drugs.com/condition/migraine.html

There is one other possibility amongst many not mentioned. Tumor. It is essential that you see a physician about this and be thoroughly checked out. No need to suffer in this day and age. Is there a reason you have not seen a physician? I know we can be afraid in case we have something like cancer or whatever our deepest fears may be. Generally it is something known with treatment. Keep in touch with us so we know how your doctor is helping you. Ok? Best of the holidays to you and your search for real relief.